Reinforce and backing for artificial teeth.



No. 848,863. PATENTED APR. 2; 1907.-

- I. STERN. REINFORUE AND BACKING FOR ARTIFICIAL TEETH.

. APPLICATION FI'L'ED JULY 16, 1906.

VIII/[Illa THE NORRIS PETERS co WASVHINCTCN, u. c.

ISIDORE STERN, OF NEW YORK, N. Y.

REINFORCE AND BACKING FOR ARTIFICIAL TEETH.

Specification of Letters Patent.

Patented April 2, 1907.

Application filed Jul 16,1906. Serial No. 826,335.

To all whom, it may concern:

Be it known that I, IsIDoRE STERN, a citizen of the United States, residing at New York city, New York county, New York, have invented certain new and useful Improvements in Reinforce and Backing for Artificial Teeth, of which the following is a full, clear, and exact description.

My invention relates to a new and improiiled reinforce and backing for artificial teet One important object of the invention is to very materially save in cost, and this without sacrificing strength or quality.

Figure l is a cross-section, slightly in perspective, of a portion of a strip of material before it is finished. Fig. 2 represents the same strip after it has been partially rolled down toward the finished state. Fig. 3 is a similar view of the same strip rolled down still more. Fig. 4 conventionally shows the same strip rolled down to a finished state. Fig. 5 illustrates a portion of a tooth with the reinforce and backing material in place as it commonly appears, the material being shown in section, said view being enlarged.

In certain kinds of artificial teeth it is very 'desirable or necessary to reinforce the rear thereof with a metallic backing. Pure gold is the only material that will not become discolored and that will not give the tooth a discolored appearance. In many instances these gold backings are turned forwardly, so as to tip the biting edge of the tooth. In any event this gold portion almost invariably extends down to the biting edge in the rear in order that a sufficient and proper reinforce will be provided. To afford a proper backing, this material must be of some substantial thickness, and the result is a very considerable item of expense. It is to reduce this expense without sacrificing the quality that I have devised this invention.

I will first refer to Fig. 5 of the drawings. In this figure, A represents a portion of an artificial tooth. B represents a solid-gold tip at the cutting edge. B represents that part of the backing which is of the same material as the tip B. B represents that portion of the backing which is of a less costly metal.

It is customary in reinforcing a tooth, as shown in Fig. 5, to finally round out the back with gold solder. This rounded-out portion is indicated by dotted lines and by the reference-letter O. The backing itself, and before it is made up and shaped to fit upon the back of a tooth, is shown in the form of a strip in Fig. 4. In this figure it will be observed that one edge B is solid, the metal being gold. B is likewise solid and integral with the solid edge B. B however, is of a less expensive metal. WVhen the backing is applied to the tooth, the gold facing B is applied directly to the rear surface of the tooth,

so that no discoloration will occur which will show through the tooth. The gold solder covers and protects the layer of inferior metal B. To what extent a saving is made in the cost of the material is more apparent by an examination of the drawings, Figs. 1, 7o 2, and 3, in which views it will clearly appear that the proportions of gold to the less costly metal is only about one-half. A very considerable saving is therefore made, which, though of small consequence in a single tooth, is a very substantial item in the long run.

It should be understood that the drawings are illustrative merely and that the propor tions shown therein of gold to the base metal 30 are by no means definitive. This may be modified as desired, it being merely essential that at one edge of the sheet of backing material there shall be a solid-gold portion of sufficient width to act as a tip toreinforce or 5 protect the edge of the tooth. Obviously if this were not provided it would be impossible to tip the tooth without exposing the base metal, because the gold surface must be applied to the rear surface of the tooth in 9 practice. The method of forming the strips comprise, first, making a block, such as shown in Fig. 1, firmly uniting the two metals, as shown, and then rolling the same longitudinally, so as to draw it out into the form of the sheet shown in Fig. 4. How the material is formed, however, is immaterial to this invention so long as the two layers of metalsare intimately united and of different widths.

What I claim is I00 1. A metallic tooth backing and reinforce, including two layers of different metals of different widths, both of said layers being intimately united, one layer being of solid gold and providing a solid-gold border at one 5 edge.

2. A metallic tooth backing and reinforce, including two layers of different metals of different widths, both of said layers being'intimately united, one layer being of solid gold :10

and providing a solid-gold border at one biting edge thereof, and a reinforcing layer edge, said backing being of substantially the of different metal intimately united with the 10 same thickness throughout. gold facing at the back thereof, and a cover- 3. A metallically reinforced artificial ing of gold solder for said reinforcing layer. tooth, comprising a tooth of porcelain-like ISIDORE STERN. material, a metallic backing comprising a Witnesses: facing of gold bearing directly against the CHAs. A. PEARD, rear face of said tooth and overstanding the L. VREELAND. 

